Hi Peg,
I am normally 130 pounds, and have been for about 50 years!
However, now I have reached the 18 years mark, I am also having diffficulty in swallowing. For the first time I have dropped in weight to 123 pounds, and as you know I can't afford to lose any weight!!
I have real problems with large capsules, and have to cough them back up several times before I get them down the right way.
I have been also recommended to tip my chin down when I swallow, but it does not help for me.
The only tip I could give is if you find difficulty swallowing a certain large pill or capsule, try taking it with a hot drink that is not too hot so you can gulp it down with the pill. It seems to open the throat, and you can swallow quite a large pill I also find a hot drink seems to make a pill work faster.
Sorry about your son, and hope he has made as full recovery.
Best Wishes
Ron